Infill is the foundation of every artificial turf field's performance characteristics. As it migrates, compacts, and depletes over time, it takes both safety performance and warranty compliance with it. Infill depth measurement tells you exactly where your field stands -- before you find out the hard way.
Schedule an Infill Depth AssessmentArtificial turf is not a single material -- it is a system. The synthetic fiber blades are tufted into a backing and extend upward, but those fibers alone would be rigid and unsafe to play on. Infill is the granular material broadcast between the fiber blades that gives the surface its softness, stability, and playability.
Without adequate infill, the fibers collapse flat and the backing becomes the playing surface. With proper infill depth, the fibers stand upright, the surface absorbs impact energy, and the field behaves as the system was designed to perform.
Recycled rubber particles from tires (SBR) or manufactured from virgin rubber (TPE). The most common infill in North American fields. High density, effective at impact attenuation, but heat-retaining and subject to compaction.
Used as either the primary infill or as a base layer beneath rubber in dual-infill systems. Provides weight and stability to keep fibers upright. Less effective at impact attenuation on its own but improves drainage characteristics.
Increasingly specified in newer installations. Lower heat retention than rubber, environmentally preferable, but more susceptible to biological degradation and compaction over time. Performance characteristics change as the material breaks down.
Newer generation infills including coated TPE and polymer-coated crumb rubber designed to reduce heat and prevent migration. Performance profiles differ from uncoated materials and change differently with age.
Regardless of infill type, every field is installed with a designed infill depth specified by the turf manufacturer. That specification is not arbitrary -- it is the depth at which the system was tested and certified to meet its performance and safety specifications. Falling below it is both a safety problem and a warranty problem.
Infill loss is not a dramatic event -- it is a slow, continuous process driven by the normal use of the field. By the time it is visible to the naked eye, significant loss has already occurred in the underlying profile.
Every planted foot, every tackle, every sliding stop moves small amounts of infill from where it started. Over thousands of athlete contacts, this displacement adds up. High-traffic zones like goal mouths in soccer, scrimmage lines in football, and pivot points at hash marks experience infill displacement many times faster than the rest of the field.
Infill naturally migrates toward the edges of the playing surface over time. Cleats move it incrementally outward with each game and practice. Fields with drainage that channels toward the perimeter compound this effect. Edge zones and warning tracks often accumulate excess infill while center zones deplete.
Lighter infill materials -- particularly fine crumb rubber and organic materials -- are susceptible to wind displacement. Rain events can wash infill toward drains or off the field entirely, particularly in fields without adequate edge retention. Over multiple seasons, these weather-driven losses accumulate.
Dragging, brushing, and grooming equipment is necessary for maintaining fiber upright orientation, but aggressive maintenance with the wrong equipment or wrong settings can displace significant amounts of infill. A maintenance program that is not calibrated to the specific field system can accelerate infill loss rather than slow it.
Research and field data from the turf industry indicates that fields can lose 20 to 30 percent of their original infill volume within the first three to five years of service without an active infill replenishment program. On a high-use field seeing 200 or more events per year, this timeline can be shorter. Infill loss in this range is not a worst-case scenario -- it is the expected trajectory for a field that is not actively managed.
Some signs of infill depletion are visible to anyone who walks the field. Others require measurement to detect. Waiting until the visible signs appear means infill has already reached a level that is affecting performance.
Flattened fiber blades that do not stand upright after light brushing
Visible backing material in goal mouths, at line of scrimmage areas, or along high-traffic sideline zones
Hard spots underfoot that feel noticeably different from the rest of the field
Uneven surface texture with some zones visually different from adjacent zones
Infill depth readings below manufacturer specification at one or more test points
GMAX values elevated in specific zones, indicating loss of shock attenuation in those areas
Shear factor readings outside the safe range in high-traffic zones
Widening variance between the highest and lowest infill depth readings across the field
Every artificial turf field is designed and installed with a specified infill depth -- typically expressed in millimeters and sometimes broken down by infill type in dual-infill systems. This specification appears in the installation documentation and is part of the product warranty terms.
Most turf warranties include language that ties warranty coverage to maintenance compliance, including maintaining infill at the specified depth. A field operating significantly below spec is not being maintained in accordance with warranty terms. If the manufacturer investigates a premature fiber or backing failure on a field with depleted infill, the warranty claim can be denied.
For a field with a 10-year warranty representing a $500,000 to $1,000,000 capital investment, documented evidence of infill depth maintenance is not just a safety issue -- it is a financial protection issue. Annual infill depth testing creates the documentation record that supports a warranty claim if and when one becomes necessary.
Infill loss is not uniform across a field. It follows the patterns of use. Goal mouths may be at 40 percent of specified depth while the center of the field is still at 85 percent. This creates a field with highly variable performance characteristics depending on where the athlete happens to be standing.
An athlete sprinting down the center of the field and cutting toward the goal is transitioning from a field behaving at one performance level to a field behaving at a very different level within a few strides. That transition is neither predictable nor consistent -- and inconsistent surface behavior is its own injury risk, separate from the absolute values at either extreme.
A spot check at the center of the field, or an average across a handful of points, will not reveal this spatial variability. Mapping infill depth across the entire field -- with enough test points to see the distribution, not just the average -- is what gives you actionable information about where the field needs attention.
We measure infill depth using calibrated probes inserted into the turf surface at a structured grid of points across the entire field. Each measurement records the depth of infill above the backing, which is then compared against the manufacturer's specified depth for that field.
We test at a minimum grid density that captures the spatial distribution of infill across all playing zones, including goal mouths, midfield, hash mark areas, and sideline zones.
We record the manufacturer specified depth for the field and express each reading as both an absolute depth and a percentage of specification.
We identify and flag any zones where infill depth falls below a threshold that warrants replenishment.
All test points are geo-referenced so the results can be mapped and compared against the same locations on future visits.
Infill depth data is correlated with GMAX and shear factor data from the same visit, allowing direct analysis of how infill condition is affecting performance metrics.
When infill depth testing identifies zones that need replenishment, the solution is topdressing -- adding new infill material and working it into the fiber pile to restore specified depth. This is maintenance work performed by a qualified turf maintenance contractor, not by Field Health Systems. Our role is to identify where the field stands, document the findings, and provide the data that guides the maintenance decision. We can refer you to qualified maintenance providers in your area.
Infill depth data becomes most powerful when tracked over multiple test cycles. The rate of infill loss -- how much is being lost per year, and in which zones -- tells a more complete story than any single reading.
Our software platform stores all infill depth readings from every visit, maps them to their test point locations, and graphs the trend over time. When a zone is losing infill at an accelerating rate, the platform flags it so your team can investigate the cause -- whether it is unusual traffic patterns, an equipment issue, or drainage problems directing infill displacement.
This trend data also allows for maintenance budget planning. Instead of reacting to a failing field, facilities managers can project when infill replenishment will be needed based on the current loss rate and budget accordingly -- often the difference between a planned topdressing during the off-season and an emergency repair during the playing season.
Full-field infill depth mapping with zone-by-zone results, manufacturer spec comparison, and trend tracking over time. Serving all of Texas from DFW.
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